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A native White-clawed crayfish at Wallington, Northumberland in March 2022. White-clawed crayfish are Britain’s only native freshwater crayfish. Although they are in decline across the country, they can be found in many of the watercourses on the Wallington estate in Northumberland because of the high water quality and lack of pollutants. An “ark” refuge is being created by the National Trust to help save one of the UK’s most endangered native species from extinction. (Photo by Annapurna Mellor/National Trust Images)
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